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English definition of “spiral”

spiral

adjective [before noun]     /ˈspaɪə.rəl/ US  /ˈspaɪr.əl/
shaped in a series of curves, each one above or wider than the one before: a spiral staircase a spiral galaxyProperties of circles and curves
(Definition of spiral adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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